Complete Step 7 from page 7-7. I "spot" primed inside rudder skins along rivet lines (only surface having been worked…otherwise Alclad provides protection).
Step 8 on page 7-7: Countersink Trailing Edge. Set up drill press to countersink perpendicular to TE wedge surface. Both sides .... but had to be careful to go deep enough to fully accept skin dimples but insure not too deep to enlarge hole diameter (if meet from either direction) ! Careful iteration on trial piece was necessary, including trial fit with dimpled samples.
Also, finished dimpling spar and rib flanges. Ready to start riveting...